New Years Eve 1999. Earth is about to run out of time. Returning home to Gallifrey with the remains of his arch enemy, the Master, the Tardis is forced off course, plunging the Doctor into the middle of a street gang's gun battle in downtown San Francisco. Critically wounded in the shoot out, the Doctor has to regenerate to save his own life. And he's not the only one - the Master too has a new body with which to wreak havoc, and his ultimate goal is to take the Doctor's own existence. As the clock counts down to the start of a new millennium, the Doctor has to stop the Master destroying all life on Earth. But at what cost...?